Ktor client on Android

appBuild.gradle

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlinx-serialization'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.android.vengateshm.ktorclientsample"
        minSdk 21
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {
    implementation 'androidx.core:core-ktx:1.6.0'
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1"
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.3.1"

    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1'
    implementation 'io.ktor:ktor-client-android:1.5.0'
    implementation 'io.ktor:ktor-client-serialization:1.5.0'
    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.1'
    implementation 'io.ktor:ktor-client-logging-jvm:1.5.0'

    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

MainActivity.kt

import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import io.ktor.client.*
import io.ktor.client.engine.android.*
import io.ktor.client.features.*
import io.ktor.client.features.json.*
import io.ktor.client.features.json.serializer.*
import io.ktor.client.features.logging.*
import io.ktor.client.features.observer.*
import io.ktor.client.request.*
import io.ktor.http.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.serialization.Serializable

private const val TIMEOUT = 60_000

class MainActivity : AppCompatActivity() {

    private val tag = MainActivity::class.java.simpleName

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val httpClient = HttpClient(Android) {
            install(DefaultRequest) {
                header(HttpHeaders.ContentType, ContentType.Application.Json)
            }

            install(ResponseObserver) {
                onResponse {
                    Log.d(tag, "HTTP Status : ${it.status}")
                }
            }

            install(JsonFeature) {
                serializer = KotlinxSerializer(kotlinx.serialization.json.Json {
                    prettyPrint = true
                    ignoreUnknownKeys = true
                    isLenient = true
                })

                engine {
                    connectTimeout = TIMEOUT
                    socketTimeout = TIMEOUT
                }
            }
            install(Logging) {
                logger = object : Logger {
                    override fun log(message: String) {
                        Log.d(tag, message)
                    }
                }
                level = LogLevel.ALL
            }
        }

        lifecycleScope.launch(Dispatchers.IO) {
            try {
                val response =
                    httpClient.get<List<ToDo>>(urlString = "https://jsonplaceholder.typicode.com/todos")
                Log.d(tag, "Response $response")
            } catch (e: Exception) {
                Log.d(tag, "Error ${e.message!!}");
            }
        }
    }
}

@Serializable
data class ToDo(
    val userId: Int,
    val id: Int,
    val title: String,
    val completed: Boolean
)

projectBuild.gradle

buildscript {
    ext.kotlin_version = '1.5.31'
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.2"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.31"
        classpath "org.jetbrains.kotlin:kotlin-serialization:${kotlin_version}"
    }
}